Drilling and tapping machine



T. E. WHITE DRILLING AND TAPPING MACHINE Filed Sept. 21, 1922 2 Sh -Sheet 1 INVENTOR. T/Eamas l1? Wk die A TTORNEY Aug. 11, 1925.

T. E. WHlTE DRILLING AND TAFPING MACHINE 2 Sheets-Sheet 2 -Filed Sept. 21, 1922 Fa'p'Z 4 "Mug MIIIJ Ea-la H ing? um \\\\\\III//// mt Ewan F/Zomasl W l BY %'5 ATTORNEY- THOMAS E. WHITE, 0F lHATElE/BURY, CONNECTICUT.

DRILLING AND TAPPING MACHINE.

Application filed September 21, 1922. Scrial'No. 589,607.

To all whom it may concern:

Be it known that l, Tlnoarns E. lVrii'ril, a citizen of the United States, and a resident of lvaterbury, county of l te-w Haven, and State of Connecticut, have invented certain new and useful Improvements in Drilling and Tapping ll iachines, of which the following is a specification This invention relates to machine tools and more particularly to a machine attachment adapted to be secured to a driving shaft for producing horizontal holes in solid metal parts.

One object of the invention is to provide a machine ofthe above nature which may be secured either to a horizontal or to a vertical driving shaft.

A further object is to provide a machine of the above nature having a plurality of toolholding elements, and means for reversing the direction of said tool holding elements. y

A, further object is .to provide a tapping attachment, which may be applied either to the vertical shaft of a drill-press or to the horizontal shaft of a lathe or work bench.

A. further object is to provide a tapping attachment having mechanism for permitting the tool to be reversed when the tapped hole has reached the desired depth.

A further object is to provide a tapping attachment, of the so called turret type, having a swiveled casing for holding a plu rality of tools, said tools being adapted to be successively indexed into operating position adjacent the work.

A further object is to provide a machine of the above nature having an improved form of friction drive which will permit the driving mechanism to slip, without breaking the tool or injuring the work, in case the tool should strike the bottom of the hole or otherwise encounter an excessive stress.

A further object, is to provide a machine of the above nature which will be simple and compact, easy to manipulate, cheap to manufacture and very efficient and durable in use.

l/Vith these andiother objects in vview there have been illustrated on the accompanying drawings, two. forms inwhich the invention may be conveniently embodied in practice.

1 represents a view in side elevation of the invention as itappears when applied to the vertical driving Shaft of a drill-press.

Fig. 2 is a side view of the invention, shown partly in section, and with certain parts broken away for clearness.

3 is a perspective view of the casing shown detached from the remainder of the mechanism.

Fig. a is a sectional view of the driving shaft and friction-drive mechanism.

Fig. 5 is a top view of the casing and locking handle with parts broken away.

Fig. 6 is a view of a modified form of the invention as it appears when connected to the horizontal driving shaft of a small work bench.

Previous types of reversible drilling or tapping attachments were quite complicated and the tools could not be operated to produce horizontal holes.

Moreover, such previous devices were not adapted to be readily connected to drillpresses or work benches already in use but were quite expensive to install and operate, and consequently could not be purchased except by large shops.

The present invention is designed to avoid the above and other disadvantages, and comprises a machine in which the tool-carrying spindle rotates reversibly on a horizontal axis and in which horizontal holes may be readily produced in a metal part, without the necessity of shifting the work into vertical position as was the former practice. Provision has also been made for operating two or more tools which may be indexed into position adjacent the work for succes sively operating upon the same hole.

Reference will now be had to the draw- I ings in which like reference numerals denote corresponding parts throughout the several views.

Referring more particularly to the first form of invention disclosed in Figs.'1-5, the numeral 10 designates a hollow box-like casing open at one end and having a cover 11 secured thereto in any suitable manner, as by machine screws 11 A. pillar 12 extends upwardly from the base 13 of the casing 10-and is provided with a horizontal hole 14 which is in alinement with a pair of horizontal holes15 and 16 located in the sides 17 and 18, respectively, of the easing 10.

A flanged gear-bushing 19 is fixed within the hole 14 and has loosely fitted within it a cylindrical spindle 20, the latter having its ends adapted to rotate within the hole 15 and 16. The pillar 12 is spaced from the top 21 of the casing 10, and has a flat upper section provided with a central recess 22 communicating with the' hole 14. The recess 22 serves as an oil hole for the spindle 22 and also acts as a centering means for the base of a driving shaft-26.

The top 21 of the casing is provided with a centrally located upstanding boss 23 having. a vertical recess. 24 extending downwardly through thewall of the casing 10. The recess 24 serves as a bearing for a sleeve 49 within which is located the driving shaft 26 mentioned above. A pair of slots 27 or 28 are provided on the upper section of the boss 23 and are adapted to interchangeably receivea'locking lug 29 of the pawl lever 30 pivoted at 31 to a lockingarm 32.

The locking arm 32 is provided with areduced end 33 adapted to he fitted between the ears 34-0f apair' of semicircular splitring members 35 and 36, fitting around the boss 23, previously described.

The outer ends of the split-ring members 35 and 36 are provided with ears 37 and both pairs of ears 34 and 37 are preferably adjustably secured together by bolts, washers and screws as shown. It will be evident from the above construction that whenever it is desiredto reverse the position of thecasing, from'that' shown on Fig. 2, on the driving shaft 26, it will only be necessary to press down upon the outer end of the pawl lever 30, whereupon the lug 29 will be lifted from the slot 27. This will release the casing 30 so that it maybe swung by hand or otherwise, through 180 degrees- During this operation the lug 29 will snap into the recess 28 on th other side of the casingand will hold thecasing. securely in its new position. Asclearly shownin Fig. 1, the outer end 38 of the lockinglever 32 is adapted to engage the column ofthe drill-pressto hold the casingfagainst rotation while the work is being operated upon.

It will thus be evident'that after one took-such as a: drill ha-scompleted its work, another tool-such as atap-may be indexed into correct alinement by merely swingingthe casing" about-"its axis. This featureofth'e invention is of vital'impor" tance because it permits the-production of closely duplicated parts of manufactured articles, without the necessity of changing or readjustingl tools, -j igs or fixtures.

While the present embodiment of the invention discloses a-turret form of machine havingion-ly ap'air of tool-carrying element's, itwill=beundrst0od that itis within the spirit of the invention to employ three, four, or" a largernumber of such elements.

The upper end of the driving shaft 26 istap'ered at 39 to permit the shafttobe clamped 1 to the continuously rotating shaftof a drill-press. Below'the tapered section 39, the shaft 26 has a cylindrical threaded portion 40, adjoining which is a cylindrical section 41 of reduced diameter, said latter section being threaded at its lower end 42. The lower end of the shaft is still further reduced in diameter at 43 forming a cen- -tering portion adapted to fit within the aperture 22 on the top of the already described above.

A. beveled gear 44 is mounted on the driving shaft 26 near the bottom portion thereof and is provided with a recessed portion 45 pillar 12, as

and an upper reduced neck 46 forming seats for fibre washers 47 and 48 respectively, as clearly shown in Fig. 4.

In order to provide a frictional connection between the driving shaft 26 and the gear 44, to permit relative slippage whenever the torque exceeds the danger point, a sleeve 49 is fitted loosely on the reduced cylindrical section 41, of the driving shaft 26 and rests upon the washer 48. A similar washer 50 is positioned above the sleeve 49 and is adapted to be adj ustably pressed down upon the sleeve by a compression nut 51 and a locking nut 52 threaded upon the section 40. The lower washer 47 is held in place by a nut 52 on the threaded portion 42 of the driving shaft 26.

It will thus b seen that in case the tap, drill or other tool should strike an obstruction or be otherwise subjected to an unusual stress, the gear 44 will slip upon the shaft 26, and thus breakage of the tooland injury to the work will be positively prevented.

Loosely mounted on the gear-bushing 19, are a pair of bevel gears 53 and 54. These bevel gears are provided with reduced neck sections 55 and 56 having projecting clutch pins 57 and 58 screwed therein adjacent the peripheries'thereof. A pair of clutch pins 64 and 65 which pass entirely through the spindle 20 are securedto said spindle by means of screws 66 and 67 These clutch pins 64 and 65 are adapted to be alternately engaged with the pins 57 and 58, mounted onthe gears 53 and 54, according to the direct-ion of rotation desired.

A pair of tool-holdingchucks 59 and 60 of any suitable standard construction are mounted upon the outer ends of the spindle 20 and are so spaced apart that when the chuck 60 rests against the boss 62, the chuck 59 will belocated at-a distance from the boss 63.

By means of the above construction it- 58 and 65 are in engagement with oneqanother, the pins 57 and 64 will be out of engagement.- lVith the parts arranged as shown in Fig. 2,'the' gear 54 willcommunicate' its rotation to the chuck 60, through the medium of the clutch pins 58 and 65;

Whenever it is desired to reverse the rowithdrawing a tap from a tapped hole,-it will only be necessary to slide the spindle longitudinally in its bearings to bring the other set of clutch pins 57 and 64 into engagement. The rotation of the gear 53 will then be communicated to the spindle and cause the tool to rotate int-he opposite direction.

It will be understood that in practice when the work is being fed against the tool, the pressure ofthe work will force the operating chuck against the adjacent side of the casing, thus causingthe rotation to be gov: erned by the gear upon the nearer end of the casing 10. Then, however, the tool is withdrawn from the work, there will be a tend ency for the tool to move with the work causing the clutch at the other end of the tools.

spindle to automatically come into operation and rotate the tool in'the opposite direction. It will be understood that the chucks or tooLcarrying elements may be of any desired size orlshape and may carry any desired In the drill-press illustrated in Fig. 1, the casing is arranged to rotate on the vertical head of the press. The work is carried on a suitable table 68 resting on the base 69 ofthe drill press, and is preferably held in position by a suitable jig 70. The 7 O is preferably slidable on the table 68 toward and away from the tool, while the tool itself remains stationary. A stop 74 on the table 68 located in the path of the jig 70,

serves to limit the depth of the hole to be cut in the work.

In Fig. 6 a slightly modified form of the invention is illustrated as it appears when installed upon a small work bench having a horizontal shaft. The work in this instance is supported by a suitable jig or fixture 71 which is slidably mounted upon horizontal rods 72 carried upon a fiat base The locking lever 32 described above may be employed upon this second form of the invention if desired, but it is preferably omitted, in which case the casing may be held against undesired rotation by means of a suitable stop (not shown) which may be located on the stationary part of the work bench. In this embodiment, the height of the casing 10 above the base 73 should be such that when the casing is indexed about its horizontal axis, the tools carried in the chucks 59 and will not strike the base 73. A step may be positioned in the path of the jig 71 to limit the depth of the hole produced in the a work.

One advantage of this invention is that no special gear shifting levers are required to reverse the rotation of the machine, this being accomplished by merely sliding the spindle itself back and forth relative to the casing 10.

stood that these forms are shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosures, but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention,

what is claimed as new, and for which it is desired to secure Letters Patent, is:

1. In a tapping machine, a casing, a driving shaft rotatable in one direction. mounted in said casing, a driving gear on said driving shaft, a tool-operating spindle slidably mounted in said casing, a bushing surrounding said spindle, a'pair of driven gears rotatably mounted on said bushing, said driven gears meshing with opposite sides of said driving gear, and means on said spindle for alternately clutching said driven gears therewith to cause the spindle to rotate in opposite directions.

2. In a tapping machine, a casing, a driving shaft in said casing, a driving gear on said driving shaft, a tool-operating spindle slidably mounted in said casing at right angles to the axis of said driving shaft, said spindle carrying a tool-holding chuck on each end, a pair of driven gears continuously operated by said driving gear in opposite directions, and means operated by reversing the rectilinear motion of said spindle at any position thereof for alternately communieating the rotation of said driven gears to said spindle.

3. In a tapping attachment for machine tools, a casing, a driving shaft mounted in said casing and rotatable in one direction, a driving gear on said driving shaft, a tooloperating spindle slidably mounted in said casing at right angles to the axis of said driving gear, a bushing surrounding said spindle, a pair of driven gears rotatively mounted on said bushing, said driven gears meshin with opposite sides of said driving gear and means on said spindle for alternately engaging with said driven gears to cause the spindle to rotate in opposite directions.

ii In tapping attachment for a drill press, acasing, means for securingsaid' casingto' the' head of said drill press, a driving sh a ft mouiited in said casing, means for con- "necting said driving shaft to the rotary shaft of said drill press, a tool-carrying spindle slidably mounted in said casing, a

pair'of chucks secured tothe ends of said spindle, and clutch means on said spindle ing shaft mountedin said casing,-Ineans for connecting said driving shaft-to the rotary shaft of said drill press, a spindle slid'ably mounted in said casing, said spindlehaving its ends e xtending out of'said casing, tool- ClluCkS OIL the ends of said spindle, clutch means on-said spindle adapted to be alternatelyI clutched with mechanism operated by said driving shaft, said clutch means being operated by reversing the rectilinear mo tion of saidspindle at any position thereof,"

said casing-be'ing-adaptedto swivel on'the head'of the drill-press whereby the tools on said spindle may be freely indexedin'to opv crating position.

6.1m a machine for threading holes in solid metal, a'casin'g, a continuously rotating driving shaft, a driving gear adapted to slip'on said driving shaft'whenever the v operating stress on the tool I becomes exces s1ve'," pair of tool-carrylng 'members" mountedin' said casing and means for alternately connecting said to0l-carrying members \vith said-drivinggear, said tool-car rying members =being connected and discon nected from said-drivingshaft by reversing the rectilinear motion of said toolcarrying members.

7. In a machine for tlirea holes in solid nietal, a casing open' at one end, a cover for said pillar extendingupwardly iromrthe bottom of s'aid casing, a driving shaft supported in said pillar and through the sides "of saidcasing, a bushingmounted on said spindle "and carrying a pair of driven gears, a' driving gear meshing with said driven gears and sec ured'to saiddriving shaft, and means for alternately connecting said driven gears With saidspindle tojrotate it in-opposite directions. a

81 In amachine for threading cylindrical holes in a solid metal body, a casing having mechanism for alternately driving 'a' plura'lityof tool-holding-chucks, a shaft'in said casingadapted to be connected tothe driving shaft of a drill-press, a boss on said 0:15- ing surrounding said shaft, a split ring loosely mounted on said boss, alocking arm pivoted to'said split ring, a spring-pressed locking pawl secured to said locking arm, said locking pawl adapted to engage with said' b'o'ss at aplurality of points, whereby said casing may be swiveled about said shaft to bring said tool-holding chuck successively into operating position.

In testimony whereof, I have affixed my sigi'iatiire to this specification.

THOMAS ELWHITE.

ding-cylindrical casing, a supporting supported by the upper end of said pillar,-a' spindle extending; 

